sctp: Set source addresses on the association before adding transports

Recent commit 8da645e101a8c20c6073efda3c7cc74eec01b87f
	sctp: Get rid of an extra routing lookup when adding a transport
introduced a regression in the connection setup.  The behavior was

different between IPv4 and IPv6.  IPv4 case ended up working because the
route lookup routing returned a NULL route, which triggered another
route lookup later in the output patch that succeeded.  In the IPv6 case,
a valid route was returned for first call, but we could not find a valid
source address at the time since the source addresses were not set on the
association yet.  Thus resulted in a hung connection.

The solution is to set the source addresses on the association prior to
adding peers.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 6e5f0e0..cd2e187 100644 (file)
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1980,7 +1980,7 @@ void sctp_assoc_set_primary(struct sctp_association *,
 void sctp_assoc_del_nonprimary_peers(struct sctp_association *,
                                    struct sctp_transport *);
 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *,
-                                    gfp_t);
+                                    sctp_scope_t, gfp_t);
 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *,
                                         struct sctp_cookie*,
                                         gfp_t gfp);

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 8450960..7eed77a 100644 (file)
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1485,15 +1485,13 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len)
  * local endpoint and the remote peer.
  */
 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc,
-                                    gfp_t gfp)
+                                    sctp_scope_t scope, gfp_t gfp)
 {
-       sctp_scope_t scope;
        int flags;
 
        /* Use scoping rules to determine the subset of addresses from
         * the endpoint.
         */
-       scope = sctp_scope(&asoc->peer.active_path->ipaddr);
        flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0;
        if (asoc->peer.ipv4_address)
                flags |= SCTP_ADDR4_PEERSUPP;

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index c8fae19..d4df450 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -384,6 +384,11 @@ sctp_disposition_t sctp_sf_do_5_1B_init(const struct sctp_endpoint *ep,
        if (!new_asoc)
                goto nomem;
 
+       if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
+                                            sctp_scope(sctp_source(chunk)),
+                                            GFP_ATOMIC) < 0)
+               goto nomem_init;
+
        /* The call, sctp_process_init(), can fail on memory allocation.  */
        if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
                               sctp_source(chunk),
@@ -401,9 +406,6 @@ sctp_disposition_t sctp_sf_do_5_1B_init(const struct sctp_endpoint *ep,
                len = ntohs(err_chunk->chunk_hdr->length) -
                        sizeof(sctp_chunkhdr_t);
 
-       if (sctp_assoc_set_bind_addr_from_ep(new_asoc, GFP_ATOMIC) < 0)
-               goto nomem_init;
-
        repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len);
        if (!repl)
                goto nomem_init;
@@ -1452,6 +1454,10 @@ static sctp_disposition_t sctp_sf_do_unexpected_init(
        if (!new_asoc)
                goto nomem;
 
+       if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
+                               sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0)
+               goto nomem;
+
        /* In the outbound INIT ACK the endpoint MUST copy its current
         * Verification Tag and Peers Verification tag into a reserved
         * place (local tie-tag and per tie-tag) within the state cookie.
@@ -1488,9 +1494,6 @@ static sctp_disposition_t sctp_sf_do_unexpected_init(
                        sizeof(sctp_chunkhdr_t);
        }
 
-       if (sctp_assoc_set_bind_addr_from_ep(new_asoc, GFP_ATOMIC) < 0)
-               goto nomem;
-
        repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len);
        if (!repl)
                goto nomem;

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c8d0575..bf705ba 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1080,6 +1080,13 @@ static int __sctp_connect(struct sock* sk,
                                err = -ENOMEM;
                                goto out_free;
                        }
+
+                       err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
+                                                             GFP_KERNEL);
+                       if (err < 0) {
+                               goto out_free;
+                       }
+
                }
 
                /* Prime the peer's transport structures.  */
@@ -1095,11 +1102,6 @@ static int __sctp_connect(struct sock* sk,
                walk_size += af->sockaddr_len;
        }
 
-       err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
-       if (err < 0) {
-               goto out_free;
-       }
-
        /* In case the user of sctp_connectx() wants an association
         * id back, assign one now.
         */
@@ -1689,6 +1691,11 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
                        goto out_unlock;
                }
                asoc = new_asoc;
+               err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
+               if (err < 0) {
+                       err = -ENOMEM;
+                       goto out_free;
+               }
 
                /* If the SCTP_INIT ancillary data is specified, set all
                 * the association init values accordingly.
@@ -1718,11 +1725,6 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
                        err = -ENOMEM;
                        goto out_free;
                }
-               err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
-               if (err < 0) {
-                       err = -ENOMEM;
-                       goto out_free;
-               }
        }
 
        /* ASSERT: we have a valid association at this point.  */